// SERVER-20812 Current primary rejects vote request from higher-priority node
// because of stepping down. In a two node replset, this rejection will prevent
// smooth priority takeover.

// TODO: We have to disable this test until SERVER-21456 is fixed, due to the
// race of tagging and closing connections on stepdown.
if (false) {

load("jstests/replsets/rslib.js");

(function() {

"use strict";
var name = "two_nodes_priority_take_over";
var rst = new ReplSetTest({name: name, nodes: 2});

rst.startSet();
var conf = rst.getReplSetConfig();
conf.members[0].priority = 2;
conf.members[1].priority = 1;
rst.initiate(conf);
rst.awaitSecondaryNodes();
// Set verbosity for replication on all nodes.
var verbosity = {
    "setParameter" : 1,
    "logComponentVerbosity" : {
      "verbosity": 4,
      "storage" : { "verbosity" : 1 }
    }
}
rst.nodes.forEach(function (node) {node.adminCommand(verbosity)});

// The first node will be the primary at the beginning.
rst.waitForState(rst.nodes[0], ReplSetTest.State.PRIMARY, 60 * 1000);

// Get the term when replset is stable.
var res = rst.getPrimary().adminCommand("replSetGetStatus");
assert.commandWorked(res);
var stableTerm = res.term;

// Reconfig to change priorities. The current primary remains the same until
// the higher priority node takes over.
var conf = rst.getReplSetConfig();
conf.members[0].priority = 1;
conf.members[1].priority = 2;
conf.version = 2;
reconfig(rst, conf);

// The second node will take over the primary.
rst.waitForState(rst.nodes[1], ReplSetTest.State.PRIMARY, 60 * 1000);

res = rst.getPrimary().adminCommand("replSetGetStatus");
assert.commandWorked(res);
var newTerm = res.term;

// Priority takeover should happen smoothly without failed election as there is
// no current candidate. If vote requests failed (wrongly) for some reason,
// nodes have to start new elections, which increase the term unnecessarily.
if (rst.getConfigFromPrimary().protocolVersion == 1) {
    assert.eq(newTerm, stableTerm + 1);
}
})();

}
